Method of making vibration insulators



March 7, 1939.

c. SAURER METHOD OF MAKING VIBRATION INSULATORS 2 Sheets-Sheet 1Original Filed April 4, 1931 as so ////m m HY March 7, 1939. c. SAURER2,149,902

METHOD OF MAKING VIBRATION INSULATORS Original Filed April 4, 1931 2sheets-Shea 2 C(ttorneg Patented Mar. 7, 1939 warrior) or MAKINGVIBRATION msum'rons Curt Sanrer, Akron, Ohio, assignor to The FirestoneTire & Rubber Company, Akron, Ohio, a corporation oi Ohio Originalapplication April 4, 1931, Serial No. 527,756, now Patent No. 2,047,493,dated July 14, 1936. Divided and this application June 9, 1936, Serial-No..84,318

2 Claims. (Cl. 29-148) s PATENT orrlce This invention relates to methodsof making vibration insulators, and more especially it re,- lates to themanufacture of vibration insulators comprising rubber, whichinsulatorsmay be used as resilient supports or for other types of yielding orflexible connections.

The chief objects of the invention .are to efiect economy in themanufacture of vibration insulators; to provide for the economical andfacile production of various vibration insulators of the same structurebut of difierent lengths and drilling; and to provide an improved methodof manufacturing vibration insulators.

Of the accompanying drawings:

Figure 1 is a perspective view of a vibration insulator made accordingto the invention.

Filgure 2 is a section on the line 2-2 of Figure Figure 3 is a modifiedform of the embodiment shown in Figure 1.

Figures 4, 5, 6, '7, and 8 are other embodiments of the invention.

This application is a division of my prior Piatent No. 2,047,493, issuedJuly 14, 1936.

As is shown in the drawings, the respective structures involving theinvention are oi indef= inite length. In practice, the respectiveinsulators are made in conveniently long lengths, sufficient to providea plurality of individual insulators, and are so furnished to thecustomer who severs them transversely into individual insulators of thelength desired. The insulators may or may not be provided with aperturesfor the reception of attaching means such as bolts since in some casesthese are made by the customer to fit a particular installation.However, the invention contemplates the feature of insulators havingthreaded holes formed in the metal parts thereof before assembly withthe rubber portion of the structure, and provision is made forpreventing the entry of rubber into the threaded holes.

Referring to Figures 1 and 2 of the drawings, it is a metal base strip,II is a metal strip of the same length but narrower width than the basestrip l0 superposed on the latter centrally thereof, and I2 is a cushionof resilientrubber positioned between the strips i0, H and bonded toeach of them, preferably by vulcanization. The base strip I!) may beformed with a lon tudinal series of apertures 13, i3 laterally oi thestrips H, I! at each side thereof, but preferably these apertures areformed therein after the strip is subsequently severed into individualunits. The strip II is formed with a longitudinal series of threadedholes M, It having axes parallel to the axes of the apertures l3. Qn theinner face of the strip II, which face is vulcanized to the rubbercushion 12, the holes it are countersunk, and respective metal disks l5(Figure 2) are fitted into each of said countersinks to prevent the ruber of the cushion 12 from flowing into the holes H. The composite stripsubsequently is transversely severed as at IE to provide a plurality ofindividual insulators l1. 1

The form of insulator shown in Figure 3 comprises a base strip I0,superposed strip H, and intermediate rubber cushion l2 bonded to saidstrips, all of which parts are identical with corresponding parts of thestructure shown in Figures 1 and 2 except that the apertures andthreaded holes are omitted. The assembled strip subsequently istransversely severed, by the customer, at [6! to provide a plurality ofindividual strips such as the strip H. The strips l'l subsequently aresuitably drilled by the customer to fit the particular installation inwhich they are employed. The structure shown in Figure 3 may be severedinto individual strips ll of any suitable length, and thus has a certainadvantage over the structure shown in Figure 1 wherein the severingbears a determinate relation to the drilling.

The structure shown in Figure 4 comprises parallel, spaced-apart,angular lateral strips 88, i8, 8. channel strip I 9 positioned betweenthe strips id and parallel thereto, thebase of the channel preferablybeing uppermost and the entire strip being somewhat elevated withrelation to the strips is, and cushions of resilient rubber 20, 2Bvulcanized to the respective lateral faces of the channel and to theadjacent lateral faces of the respective angle strips is. Atleast thebottom face of each cushion 20 is arcuate as shown, the arrangementbeing such that as the channel It is depressed during use the bottomface 0! each cushion progressively makes contact, as shown in the dottedline position, with the surface 2| of the supporting strucdeflectionwhen put under compression by downward movement of the channel IS. Thestructure is made in indefinite lengths and subse- 2|, 28, respectivecushions of resilient rubber 2 20, "mounted along the adjacent edges ofthe strips 2! on the upper faces thereof, and a metal top strip 21overlying the rubber cushions 26 and spanning the. space between thestrips 25, the

' surfaces of the rubber cushions being bonded to the adjacent surfacesof said strips. As in the other embodiments of the invention,-thestructure is of indefinite length and is severed into.

individual units 28 by the customer. The customer also drills the unitsas desired, the bridgelike construction of the insulator facilitatingthe mounting of bolts, such as the bolt 28 indicated in broken lines,through the top strip 21.

In Figure is showna vibration insulator comprising a pair of duplicaterubber and metal assemblies each consisting of ametal base strip 30, aparallel, metal top strip 3| extending longitudinally thereof andpartially in overlapping relation therewith, and a resilient rubbercushion strip 32- mounted between the overlapping portions of strips 30and Si, leaving free margins of the metal strips extending laterally onopposite sides of the cushion strip. As in all other embodiments of theinvention, the adjacent surfaces of the metal and the rubber cushionstrips are vulcanized or bonded together and the structure is ofindefinite length to permit severing into individual units of shorterlength, and to permit drilling as desired. A pair of units are assembledin juxtaposition as shown in Figure 6, leaving a space 33 therebetweento receive bolts such as the bolt 34 indicated in broken lines, theheads of the bolts being disposed beneath the top strips 3| as shown.

Figure '7 illustrates a modification ofthe type of insulator disclosedin Figure 4, the confronting sides of angular strips ,18 and channelstrip I8 being at a slight angle to a plane perpendicular to the basestrips and-top strip, respectively, of these members. This angulararrangement provides sufficient draft to permit easy removal of thecomplete insulator from the vulcanizing mold during manufacture.

Figure 8 shows a vibration insulator comprising a pair of angle stripsII, 35, each of which has legs of unequal length, said strips beingdisposed in parallel, spaced-apart relation to each other, the long legof each strip being positioned beside the short .leg of the other stripso as to extend laterally beyond the same. A cushion 86 of resilientrubber is positioned between the strim and vulcanized or bonded to bothof them. The insulator is of indefinite length, and is severed intoservice lengths and drilled by the customer,

'the drill-holes being disposed in the marginal portion of the long legof each strip 35. I

The several embodiments of the invention described have the commonfeature of indefinite length which facilitates the manufacture of thestrips, and also permits the customer to cut them to proper lengths andto drill them to fit his particular requirement. cost of the insulators,and permits various customers to use the same type of insulator withoutrequiring the manufacturer to furnish the same in various lengths andwith various sizes and spacing of drilling.

The invention may be further modified within the scope of the appendedclaims which are not limited wholly to the specific construction shownor described.

What is claimed is:

1. The method of making vibration insulators which comprises formingthreaded apertures in a metal strip of indefinite length, inserting aclosure member in one end of each of said aper- 'tures, assembling saidstrip with a wider strip 2. The method of making vibration insulatorswhich includes the steps of forming an aperture, that is countersunk atone end, in at least one of a pair of metal members, vmounting a closuremember in said counter sink, assembling said metal members with anintervening layer of unvulcanized rubber compomtion, the latteradjoining that face of the first mentioned metal member that includesthe aperture closure, and then uniting the two metal members byvulcanizing the intervening layer of rubber to them, said rubberpreventing displacement of the closure member and the closure memberexcluding the rubber from the aperture.

CURT SAURER.

This results in lower

